#define _CRT_SECURE_NO_WARNINGS 1

#include<stdio.h>

int main()
{
	int count = 0;
	for (int i = 1; i <= 100; i++)
	{
		if (i % 10 == 9)
		{
			count++;
		}
		if ((i / 10) % 10 == 9)
		{
			count++;
		}
	}
	printf("%d", count);
	return 0;
}